l.GENERAL
Your
TRIO'S
Electronic Voltmeter, Model VT-121,
is
a
voltmeter
of
absolute-mean value indication
type
capable
of
measuring
AC
voltages from
100
JJ
V
to
300
V
in
the
frequency range as wide
as
5 Hz
to
1 MHz on root-
mean-square value scales. (The measurable voltage range
of
the
F version
is
150
JJ
V
to
500
V.)
Your
VT-121
is
available
in
a variety
of
applications as it
is
highly
sensitive and responds accurately
to
given voltages
in
such a wide frequency range.
For
use on production
lines, it can be
controlled by a remote control device
(option).
This manual
is
prepared
in
common
to
the
three
version
of
the
Model VT-121, major differences
of
which are as follows.
VT-121: 1
mV
maximum sensitivity
and
BNC
input
and
output
connectors.
VT-121 F:
VT-121S:
1.5 mV maximum sensitivity and BNC
input
and
output
con nectars.
1 mV maximum sensitivity and
dual
input
and
output
connectors.
2.FEATURES
a.
All solid-state circuit provides a highly stable opera-
tion,
reduces warm-up
time
and saving power.
b.
Dual power differential
input
amplifiers used
in
the
entire circuit provide a high reliability and
good
characteristic
of
restoration from possible saturation
due
to
excessive inputs.
c. A large-sized Taut-band meter has a high sensitivity
and reliability.
d.
The
number
of
adjusting trimmers are minimized
with
the
use
of
the
amplifiers which are precisely
calculated
in
the
open loop gains and are negative-
biased
through
metal-film resistors as accurate
as
1%.
The amplifier characteristics, therefore, are free
from
any secular change.
e.
The
input
resistance
is
as high as
10
Mn
in
all ranges
and its
parallel capacitance
is
45
pF
or
lower.
f. The meter scales are graduated in
the
root-mean-
square values for sinusoidal waves. Also,
the
meter
has a dB
and
dBm scales convenient for measunng
relative values.
g.
The
output
terminal allows
your
VT-121
to
use
as
a
high-gain, wide-band amplifier.
h.
The
input
attenuators
are switched by a so-called
"logic
control
circuit"
so
that
a desired range can be
selected with use
of
a remote control device (option).
i. A relay and
FET
switch for range selection, controlled
by
the
logic control circuit, provide higher reliability
than usual
rotary
switch direct switching.
3
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